In Pharo/Smalltalk: 如何读取具有特定编码的文件？

Question

我目前正在阅读这样的文件：

dir := FileSystem disk workingDirectory.
stream := (dir / 'test.txt' ) readStream.
line := stream nextLine.

这在文件 utf-8 编码时有效，但当文件具有另一种编码时我无法找到该怎么做。

Answer 1

类 ZnCharacterReadStream 和 ZnCharacterWriteStream 提供使用 UTF-8（默认）以外的编码字符流的功能。首先，需要将文件流转换为 binary 流。在此之后，它可以被一个ZnCharacter*Stream包裹起来。这是写入和读取文件的完整示例：

dir := FileSystem disk workingDirectory.

(dir / 'test.txt') writeStreamDo: [ :out |
  encoded := ZnCharacterWriteStream on: (out binary) encoding: 'cp1252'.
  encoded nextPutAll: 'Über?'.
].

content := '?'.
(dir / 'test.txt') readStreamDo: [ :in |
  decoded := ZnCharacterReadStream on: (in binary) encoding: 'cp1252'.
  content := decoded nextLine.
].
content. " -> should evaluate to 'Über?'"

有关详细信息，Enterprise Pharo a Web Perspective 书中有一章是关于字符编码的。

Answer 2

对于 Pharo 7，有这个 guide for file streams，建议：

('test.txt' asFileReference)
    readStreamEncoded: 'cp-1250' do: [ :stream |
        stream upToEnd ].

In Pharo/Smalltalk: 如何读取具有特定编码的文件？

In Pharo/Smalltalk: How to read a file with a specific encoding?

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